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| Merc 190E; Jump starting 190 E can blow Sensor | |
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| Tweet Topic Started: Tue Jan 16, 2007 3:31 pm (806 Views) | |
| julian | Tue Jan 16, 2007 3:31 pm Post #1 |
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Addicted
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[SIZE=7]Hi all, i am new but have owned a 190e for 8 years. I've noticed lots of 190e owners having problems with them stalling and running poorly. So i though i would mention a problem that can often occur. This happened to me twice, luckily my local mechanic was a trianed Mercedes mechanic, who started his own garage. He diagnosed the problem straight away, but not many general mechanics will know this. Prior to the problem of the car running badly and stalling, i had jump started a colleagues car with my 190E the next day the car ran awful, so took it to my local mechanic. After a quick examination, the first thing he asked me was; had i jump started any cars prior to the problem. I was quite amazed as i had, as stated, and in recollection i can remember the 2 jump lead ends neg and pos touching and causing a spark. Not a big deal for most cars, but do this on a 190E and it will immediately blow the lambda sensor, almost guaranteed. (Not only when jump starting either, if your working on the car and accidently short the terminals whilst connected, it will blow this sensor) This sensor is situated in the exhaust system. Oh well i thought easy to put right won,t cost much. I should be so lucky. The Mercedes Lambda sensor costs around £90 this was 4 years ago. However my mechanic knew that Bosch make the sensors, so using a computer part matching program he managed to get the identical sensor for around £65 straight from Bosche, however the lead to the Bosch sensor is different and has to be wired to the existing lead on the blown Merc sensor, as Mercedes use a different connector, and charge far more for the part. Oh well! I thought ok with fitting it will probably cost me no more than £100 Well i should be so lucky hussh.gif Not only can this sensor be expensive, but it is located somewhere near the engine end of the exhaust and on top of the exhaust, so the entire exhaust has to be removed to access remove and fit the sensor, which is 2 hours work. So my total bill was a few quid short of £200 inc v.a.t & labour NOW please read on, i was lucky this was sorted out quickly, as if the engine runs poorly due to this particular problem, it runs particularilly rich, and it can damage the Cat converter which is frightenly expensive. So if you have a 190E be aware of this, and be really really carefull when helping your mate or family out with a jump start, it could cost you probably over £200 to put right at todays prices. Hope this will be of help to members. Julian |
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| Neil | Tue Jan 16, 2007 3:46 pm Post #2 |
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Newbie
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wow, that's a really useful piece of info, especially for non-tech folk here (that includes me!). thankfully i've never jump-started another car with mine yet. |
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| Big Ben | Tue Jan 16, 2007 6:03 pm Post #3 |
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Sneaky 2.5-16 Driver!
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Shorting the battery leads while jump starting causes problems on most cars! It can cause all sorts of damage to electronic systems. Jump starting can also cause similar problems if not done properly. If you have to do it..... A few tips. 1/ Never attempt to jump start a car when its battery is completely discharged (no lights when ignition is turned on). This overloads your charging system which is not designed for this purpose. 2/ Always connect the negative wire to the engine block of the car to be started. The starter motor is bolted to the engine and uses the block as its earth. Connecting the wire in this way ensures a good connection to the motor and gives the best chance of starting the car without damaging your battery. This also applies to battery packs used as a power source. 3/ Never turn the engine over for more than a few seconds with a gap between tries on the car being jump started. 4/ If on your first try the engine turns slowly, leave alone for a little while and let your car try to charge the other cars battery. If the other cars engine still turns over slowly and wont fire, stop trying and disconnect the jump leads. Try again and if no signs of improvement then his battery is dead!! Probably one or more cells failed. I bought a good battery pack to take off roading and would recommend one to all drivers (especially those with auto boxes). |
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| stwat | Wed Jan 17, 2007 12:53 am Post #4 |
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Some great info there guys
Stu |
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| kentronix | Wed Jan 17, 2007 1:05 am Post #5 |
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I'm only really here for the Kitchens
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I cant remember who told me but I was advised a while ago to always let the cars stand with jump leads connected for 5 minutes before turning the key. Get some charge in your battery as a kind of buffer. |
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| Cosmo2.5-16 | Wed Jan 17, 2007 1:18 am Post #6 |
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Part of things
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On a modern day car when jump starting, you should turn the lights on, on both cars before you connect the leads especaly the flat one. When connected up turn off lights, doing this protects the ECUs or any other control unit from getting a sudden surge of power. They dont like sudden surges Can't under stand how the lamda sensor went on your car julian by a sudden sort, the OVP Relay fuse should of blown causing no further damage to any other compoment. |
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